Itch installation fixes

I just pushed a hotfix that should instruct the itch.io client to install prerequisites and run the game like Steam does. Anyone who was having trouble running the game before might want to try again, and please let me know if there are still issues.

Antistatic is built in a custom engine, so there are occasional rough edges that need to be smoothed over. For example, the game runs perfectly on Linux, but because of weird dependency stuff I haven’t sorted through it isn’t portable enough to offer a download yet.